Patio tabletop glass with broken protection

ABSTRACT

A patio tabletop glass with broken protection includes a tempered glass layer wherein a central hole is formed in the tempered glass layer; a protection layer which has a shape and width size identical to that of the tempered glass layer being integrally attached on a top surface of the tempered glass layer and having a center hole formed therein, wherein the center hole of the protection layer has an identical diameter of the central hole of the tempered glass layer and is coaxially aligned with the central hole of the tempered glass layer; and an adhesive layer which is evenly applied between the top surface of the tempered glass layer and a bottom surface of the protection layer so as to integrally adhere the protection layer with the tempered glass layer to form an one piece body, wherein a tension of a periphery portion of the protection layer is increased to form a protective edge of the center hole, which is made to extend around the central hole of the tempered glass layer and to ensure the periphery portion of the protection layer around the center hole securely attached around the central hole on the tempered glass layer.

CROSS REFERENCE OF RELATED APPLICATION

[0001] This is a Divisional Application of a Non-ProvisionalApplication, application number 09/650,253, filed Aug. 29, 2000, whichis a Continuation-In-Part Application of a non-provisional application,application number 09/206,922, filed Dec. 07, 1998.

FIELD OF THE PRESENT INVENTION

[0002] The present invention relates to an outdoor tabletop glass, andmore particularly to a manufacturing process of patio tabletop glasswith broken protection to prevent the broken: glass particles fromhurting the users when the patio tabletop glass is accidentally broken.

BACKGROUND OF THE PRESENT INVENTION

[0003] Patio table is one of the most popular outdoor furniture, whichnormally is placed in the patio or the back yard for the users to restand serve barbecue. For easy clean, decorating and other reasons, mostpatio table has a glass made tabletop. The tabletop glass, which issimply placed on top of a table frame, generally has a central holeadapted to hold an umbrella in position for sunshine shading.

[0004] The biggest shortcoming of the patio tabletop glass is itsfragile nature especially when using outdoors. It is reported that eventhough most of the patio tabletop glasses are made of tempered glass,the patio tabletop glass may be broken when its surface is impacted witha sharp object; when it hardly falls on ground; or when a small stonehits on it in high speed. The central hole of the patio tabletop glassis the most weakened area because of the high concentrate stressoccurred around the hole. Besides, when wild wind blows on the openedumbrella, it may cause the whole patio table to fall down and break thetabletop glass.

[0005] No matter the patio tabletop glass is broken by any aforesaidreason or other unexpected reasons, the glass is broken into particlesand/or pieces with sharp edges that may cause serious body injury to theusers, especially to the minors. However, no glass is unbreakable. Thus,the applicant of the present invention seeks a different way to resolvethe above problem, i.e. to prevent the broken glass pieces and particlesfrom breaking apart.

SUMMARY OF THE PRESENT INVENTION

[0006] It is thus a first object of the present invention to provide apatio tabletop glass with broken protection, wherein even when the patiotabletop glass is broken into pieces and p articles, the broken glasspieces and particles will not breaking apart and remain attaching to aprotection layer.

[0007] A further object of the present invention is to provide a patiotabletop glass which is fast and inexpensive adapted for massproduction.

[0008] Another object of the present invention is to provide a patiotabletop glass with broken protection, which provides a central hole ona protection layer after it is firmly adhered on a tempered glass layerwithout causing an elongated bubble popping up between the temperedglass layer and the protective layer and extending from the edge of thecentral hole to the peripheral edge of the tabletop glass.

[0009] Another object of the present invention is to provide a patiotabletop glass with broken protection, wherein the round edge of thecenter hole of the protection layer is made to form a protective edgeextended around the central hole of the tempered glass layer which isthe most weakened area because of the high concentrate stress occurredaround the central hole.

[0010] Accordingly, in order to accomplish the above objects, thepresent invention provides a patio tabletop glass with brokenprotection, which comprises a tempered glass layer having apredetermined shape and size, a protection layer made of polyvinylchloride or polyester sheet having a thickness of 0.3 to 0.8 mm and ashape and size adapted to cover a top surface of the tempered glasslayer, and an adhesive layer which has a preferred thickness between 0.1to 0.2 mm and is made of acrylic adhesive and the like being evenlyapplied between the top surface of the tempered glass layer and a bottomsurface of the protection layer so as to integrally adhere theprotection layer with the tempered glass layer to form an one piecebody, wherein the patio tabletop glass is manufactured by the steps of:

[0011] (a) fully cleaning at least the top surface of the tempered glasslayer which has a central hole thereon with neutral water having a pH of7 so as to remove any possible oil thereon;

[0012] (b) drying the cleaned tempered glass layer;

[0013] (c) heating the entire tempered glass layer to a temperaturebetween 45° C. to 65° C.;

[0014] (d) evenly applying a kind of acrylic adhesive on the top surfaceof the tempered glass layer which temperature is maintained between 45°C. to 65° C. to form the adhesive layer;

[0015] (e) attaching the protection layer having a thickness of 0.3 to0.8 mm and a width size larger than the tempered glass layer on top ofthe adhesive layer of the tempered glass layer by pressing theprotection layer against the top surface of the tempered glass layerwhich is maintained at the temperature of 45° C. to 65° C. until theprotection layer is integrally attached on the tempered glass layer,wherein the protection layer has a circular center portion formed abovethe central hole of the tempered glass layer;

[0016] (f) cutting excessive edges of the protection layer to a sizeidentical to the tempered glass layer; and

[0017] (g) forming a center hole on the protection layer, whichcoaxially aligns with the central hole of the tempered glass layer.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018]FIG. 1 is a sectional view of the patio tabletop glass inaccordance with the above preferred embodiment of the present invention.

[0019]FIG. 2 is a flow diagram of a manufacturing process for producinga patio tabletop glass in accordance with a preferred embodiment of thepresent invention.

[0020]FIG. 3 is a perspective view illustrating the cutting step inaccordance with the above preferred embodiment of the present invention.

[0021]FIG. 4 is a sectional view illustrating how the protection layeris ensured to perfectly stick on the tempered glass layer in accordancewith the above preferred embodiment.

[0022]FIG. 5 is a flow diagram of a process of forming the center holeon the protection layer in accordance with the above preferredembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0023] Referring to FIGS. 1 and 2, a preferred embodiment of the presentinvention is illustrated. As shown in FIG. 2, a patio tabletop glass 10of the present invention comprises a tempered glass layer 11, aprotection layer 12 and an adhesive layer 13. The tempered glass layer11 has a predetermined shape, thickness and width size and a centralhole 111 provided thereon. The protection layer 12 is made of polyvinylchloride or polyester sheet having a thickness of 0.3 to 0.8 mm and ashape and width size identical to that of the tempered glass layer 11.

[0024] The tempered glass layer 11 is generally made of figured glassthat has an uneven top surface 112 having specific decorative pattern.The protection layer 12 is integrally attached on the top surface 112 ofthe tempered glass layer 11 and has a center hole 121 formed thereon,wherein the center hole 121 of the protection layer 12 has an identicaldiameter of the central hole 111 and is coaxially aligned with thecentral hole 111 of the tempered glass layer 11. The adhesive layer,which has a preferred thickness between 0.1 to 0.2 mm and is made ofacrylic adhesive and the like, is evenly applied between the top surface112 of the tempered glass layer 11 and a bottom surface 122 of theprotection layer 12 so as to integrally adhere the protection layer 12with the tempered glass layer 11 to form an one piece body. Moreover,the tension of a periphery portion 123 of the protection layer 12 isincreased to form a protective edge 124, i.e. the round edge of thecenter hole 121, which is made to extend around the central hole of thetempered glass layer which is the most weakened area because of the highconcentrate stress occurred around the central hole, and to ensure theperiphery portion 123 of the protection layer 12 around the center hole121 securely attached around the central hole 111 on the tempered glasslayer 11.

[0025] For mass production, as shown in FIGS. 1 to 5, the structure ofpatio tabletop glass 10 as described above can be made according to thefollowing steps:

[0026] (a) Provide a plurality of the tempered glass layers 11 eachhaving the predetermined shape and width size as well as the centralhole 111 provided thereon.

[0027] The step (a) further comprises the steps of cutting large pieceof glass board to form a circular shaped glass layer having the specificdecorative pattern provided on at least the top surface 112, drillingthe central hole 111 on the glass layer and tempering the glass layer byheating the glass layer to about 500° C.-550° C. and then immediatelycooling down to 0° C.-40° C. to form the tempered glass layer 11.

[0028] (b) Fully clean at least the top surface 112 of each of thetempered glass layers 11 with neutral water having a pH of 7 so as toremove any possible oil thereon.

[0029] (c) Dry all cleaned tempered glass layers 11.

[0030] (d) Heat each of the tempered glass layers 11 entirely to atemperature between 45° C. to 65° C.

[0031] (e) Attach the protection layer 12 having a thickness of 0.3 to0.8 mm and a width size larger than the tempered glass layer 11 on thetop of the adhesive layer 13 of the tempered glass layer 11 by pressingthe protection layer 12 against the top surface 112 of the temperedglass layer 11 which is maintained at the temperature of 45° C. to 65°C. until the protection layer 12 is integrally attached on the temperedglass layer 11, wherein the protection layer 11 has a circular centerportion 120 formed above the central hole 111 of the tempered glasslayer 11.

[0032] As shown in FIG. 2, the step (e) further comprises the followingsteps:

[0033] (e-1) Evenly apply a layer of acrylic adhesive or the like on thetop surface 112 of each of the tempered glass layers 11 whichtemperature is maintained between 45° C. to 65° C. to form the adhesivelayer 13 having the thickness of 0.1 to 0.2 mm.

[0034] (e-2) Provide a roll of continuous protection layer 12′ havingthe thickness of 0.3 to 0.8 mm and a width size larger than that of thetempered glass layers 11.

[0035] The bottom surface of the continuous protection layer 12′ mayalso provided with a layer of acrylic adhesive or the like to facilitatethe continuous protection layer 12′ to adhere to the tempered glasslayers 11.

[0036] (e-3) Feed one end of the protection layer 12′ and the pluralityof tempered glass layers 11 one after one between a pair of parallelrubber rollers 21, 22, wherein the continuous protection layer 12′ isattached on the top of the adhesive layers 13 of the tempered glasslayers 11 in overlapped manner. The pair of parallel rubber rollers 21,22 are arranged to press the continuous protection layer 12′ against thetop surfaces 111 of the tempered glass layers 11, which are stillmaintained at the temperature of 45° C. to 65° C., until the continuousprotection layer 12′ is integrally adhered on the top surface 112 ofeach of the tempered glass layers 11.

[0037] (e-4) As shown in FIG. 3, cut off the continuous protection layer12′ according to the number of the tempered glass layers 11 into aplurality of the protection layers 12.

[0038] (f) As shown in FIG. 3. cut away the excessive edges of each ofthe protection layers 12 to a size identical to the respective temperedglass layer 11.

[0039] (g) As shown in FIGS. 2 and 3, form the center hole 121 on eachof the protection layers 12 to coaxially align with the central hole 112of the respective tempered glass layer 11 to form the patio tabletopglass 10.

[0040] According to the present invention, the step (g) furthercomprises the steps of:

[0041] (g-1) pressing the center portion 120 of the protection layer 12toward the central hole 111 of the tempered glass layer 11 thatincreases the tension of a peripheral portion 123 of the protectionlayer 12 attached around the central hole 111 of the tempered glasslayer 11 to ensure the peripheral portion 123 of the protection layer 12extending and attaching to an upper edge of the central hole 111 of thetempered glass layer 11; and

[0042] (g-2) grinding the upper edge of the central hole 111 of thetempered glass layer 11 until the center portion 120 of the protectionlayer 12 is separated from the protection layer 12 to form a center hole121 coaxially aligned with the central hole 111 of the tempered glasslayer 11.

[0043] The step (g), as shown in FIG. 5, is a specific step designed toform the center hole 121 for the present invention. It should be notedthat the center portion 120 is not directly cut from the protectionlayer 12 to form the center hole 121. It is because if the centerportion 120 is directly cut out from the protection layer 12, theperipheral edge of the center hole 121 will not be fittedly attached tothe upper edge of the central hole 111, so that further grinding stepmay be required to remove the cutting edge of the center hole 121.Moreover, to directly cut out the center portion 120 from the protectionlayer 12 will frequently cause an elongated bubble popping up betweenthe tempered glass layer 11 and the protective layer 12 and extendingfrom the edge of the central hole to the peripheral edge of the tabletopglass.

[0044] According to the present invention, no cutting is required toform the center hole 121, wherein in the step (g-1), as shown in FIG. 5,a press mold 20, which has a round shaped presser head 21 at one endthereof, is used to coaxially press against the center portion 120 bypressing into the center portion 120 into the central hole 111 of thetempered glass layer 11. The inward pressing force of the pressing head21 increases the tension of the peripheral portion 123 of the protectionlayer 12. Also, since the bottom surface 122 of the protection layer 12may also provided with adhesive layer, the inward pressing force of thepressing head 21 will further press the peripheral portion 123 of theprotection layer 12 to extend and attach to the upper edge of thecentral hole 111 of the tempered glass layer 11.

[0045] Then, in the step (g-2), a rotating sand wheel is used to grindat the position of the corresponding upper edge of the central hole 111so as to reduce the thickness of the peripheral edge of the centerportion 120 until the center portion 120 of the protection layer 12 isseparated from the protection layer 12 to form a center hole 121coaxially aligned with the central hole 111 of the tempered glass layer11. To form the center hole 121 by the pressing and grinding steps instep (g) can, at the same time, substantially eliminate uneven adheringtension of the protection layer 12 to prevent the elongated bubblespopping up between the tempered glass layer 11 and the protective layer12.

[0046] Alternatively, since the protection layer 12 is a thin film andmost of the tempered glass layers 11 to be used to make the patiotabletop glass contain decorative patterns on the surfaces, as shown inFIG. 4, in order to ensure the protection layer 12 being completelyattached on the tempered glass layer 11 under even tension, the step(e-3) can be modified to used a pair of hard rollers 21″, 22″ tosubstitute the pair of rubber rollers 21, 22. However, a pressure board30, such as a cardboard or a soft pad made of foam or rubber materialhaving a thickness of about 2 mm, should be placed on top of theprotection layer 12 before feeding between the pair of hard rollers 21″,22″, wherein the pressure board 30 can not only protect the protectionlayer 12 but also transfer the greater pressing force applied by thehard rollers 21″, 22″ to even pressure for attaching the protectionlayer 12 on the tempered glass layer 11.

[0047] In view of above, when the patio tabletop glass 10 is broken intopieces and particles, the top surfaces of each of the broken glasspieces and particles will still be individually attached to theprotection layer 12 so as to prevent the broken glass pieces andparticles from breaking apart and falling down. In other words, thepresent invention provides an effective way to solve the conventionalglass breaking problem. Moreover, the manufacturing process of the patiotabletop glass is fast and inexpensive adapted for mass production.

What is claimed is:
 1. A patio tabletop glass, comprising: a temperedglass layer having a predetermined shape, a predetermined thickness anda predetermined width size, wherein a central hole is formed in saidtempered glass layer; a protection layer having a shape and width sizeidentical to that of said tempered glass layer, said protection layerbeing integrally attached on a top surface of said tempered glass layerand having a center hole formed therein, wherein said center hole ofsaid protection layer has an identical diameter of said central hole ofsaid tempered glass layer and is coaxially aligned with said centralhole of said tempered glass layer; and an adhesive layer which is evenlyapplied between said top surface of said tempered glass layer and abottom surface of said protection layer so as to integrally adhere saidprotection layer with said tempered glass layer to form an one piecebody, wherein a tension of a periphery portion of said protection layeris increased to form a protective edge of said center hole, which ismade to extend around said central hole of said tempered glass layer andto ensure said periphery portion of said protection layer around saidcenter hole securely attached around said central hole on said temperedglass layer.
 2. A patio tabletop glass, as recited in claim 1, whereinsaid protection layer having a thickness of 0.3 to 0.8 mm,
 3. A patiotabletop glass, as recited in claim 1, wherein said top surface of saidtempered glass layer is an uneven top surface having specific decorativepattern.
 4. A patio tabletop glass, as recited in claim 2, wherein saidtempered glass layer has an uneven top surface having specificdecorative pattern.
 5. A patio tabletop glass, as recited in claim 1,wherein said patio tabletop glass is manufactured by the steps of: (a)fully cleaning said top surface of said tempered glass layer; (b) dryingsaid tempered glass layer after cleaning; (c) heating said entiretempered glass layer to a predetermined adhering temperature; (d) evenlyapplying a layer of acrylic adhesive on said top surface of saidtempered glass layer which temperature is maintained at saidpredetermined adhering temperature to form said adhesive layer; (e)attaching said protection layer on top of said adhesive layer of saidtempered glass layer by pressing said protection layer against said topsurface of said tempered glass layer which is maintained at saidpredetermined adhering temperature until said protection layer isintegrally attached on said tempered glass′ layer, wherein saidprotection layer has a circular center portion formed above said centralhole of said tempered glass layer; (f) cutting excessive edges of saidprotection layer to a size identical to said tempered glass layer; (g)pressing said center portion of said protection layer toward saidcentral hole of said tempered glass layer to increase a tension of aperipheral portion of said protection layer around said central hole ofsaid tempered glass layer and to extend and attach said protection layerto an upper edge of said central hole of said tempered glass layer; and(h) grinding said upper edge of said central hole of said tempered glasslayer until said center portion of said protection layer is separatedfrom said protection layer to form a center hole coaxially aligned withsaid central hole of said tempered glass layer.
 6. A patio tabletopglass, as recited in claim 5, wherein said predetermined adheringtemperature is between 45° C. to 65° C.
 7. A patio tabletop glass, asrecited in claim 5, wherein the step (a) further comprises the steps ofcutting a large piece of glass board to form a circular shaped glasslayer, drilling said central hole in said glass layer and tempering saidglass layer by heating said glass layer to about 500° C.-550° C. andthen immediately cooling down to 0° C.-40° C. to form said temperedglass layer.
 8. A patio tabletop glass, as recited in claim 5, wherein,in the step (g), said center portion of said protection layer is pressedby a press mold, which has a round shaped presser head at one endthereof, towards said central hole of said tempered glass layer, whereinan inward pressing force of said pressing head further presses saidperipheral portion of said protection layer to extend and attach to saidupper edge of said central hole of said tempered glass layer.
 9. A patiotabletop glass, as recited in claim 5, wherein, in the step (h), arotating sand wheel is used to grind at a position of said correspondingupper edge of said central hole so as to reduce said thickness of saidperipheral edge of said center portion until said center portion of saidprotection layer is separated from said protection layer to form saidcenter hole coaxially aligned with said central hole of said temperedglass layer.
 10. A patio tabletop glass, as recited in claim 5, wherein,in the step (a), said top surface of said tempered glass layer iscleaned with neutral water having a pH of
 7. 11. A patio tabletop glass,as recited in claim 2, wherein said patio tabletop glass is manufacturedby the steps of: (a) fully cleaning said top surface of said temperedglass layer; (b) drying said tempered glass layer after cleaning; (c)heating said entire tempered glass layer to a predetermined adheringtemperature between 45° C. to 65° C.; (d) evenly applying a layer ofacrylic adhesive on said top surface of said tempered glass layer whichtemperature is maintained at said predetermined adhering temperature toform said adhesive layer; (e) attaching said protection layer on top ofsaid adhesive layer of said tempered glass layer by pressing saidprotection layer against said top surface of said tempered glass layerwhich is maintained at said predetermined adhering temperature untilsaid protection layer is integrally attached on said tempered glasslayer, wherein said protection layer has a circular center portionformed above said central hole of said tempered glass layer; (f) cuttingexcessive edges of said protection layer to a size identical to saidtempered glass layer; (g) pressing said center portion of saidprotection layer toward said central hole of said tempered glass layerto increase a tension of a peripheral portion of said protection layeraround said central hole of said tempered glass layer and to extend andattach said protection layer to an upper edge of said central hole ofsaid tempered glass layer; and (h) grinding said upper edge of saidcentral hole of said tempered glass layer until said center portion ofsaid protection layer is separated from said protection layer to form acenter hole coaxially aligned with said central hole of said temperedglass layer.
 12. A patio tabletop glass, as recited in claim 11, whereinthe step (a) further comprises the steps of cutting a large piece ofglass board to form a circular shaped glass layer, drilling said centralhole in said glass layer and tempering said glass layer by heating saidglass layer to about 500° C.-550° C. and then immediately cooling downto 0° C.-40° C. to form said tempered glass layer.
 13. A patio tabletopglass, as recited in claim 12, wherein, in the step (g), said centerportion of said protection layer is pressed by a press mold, which has around shaped presser head at one end thereof, towards said central holeof said tempered glass layer, wherein an inward pressing force of saidpressing head further presses said peripheral portion of said protectionlayer to extend and attach to said upper edge of said central hole ofsaid tempered glass layer.
 14. A patio tabletop glass, as recited inclaim 13, wherein, in the step (h), a rotating sand wheel is used togrind at a position of said corresponding upper edge of said centralhole so as to reduce said thickness of said peripheral edge of saidcenter portion until said center portion of said protection layer isseparated from said protection layer to form said center hole coaxiallyaligned with said central hole of said tempered glass layer.
 15. A patiotabletop glass, as recited in claim 11, wherein, in the step (a), saidtop surface of said tempered glass layer is cleaned with neutral waterhaving a pH of
 7. 16. A patio tabletop glass, as recited in claim 4,wherein said patio tabletop glass is made by the steps of: (a) fullycleaning said top surface of said tempered glass layer; (b) drying saidtempered glass layer after cleaning; (c) heating said entire temperedglass layer to a predetermined adhering temperature between 45° C. to65° C.; (d) evenly applying a layer of acrylic adhesive on said topsurface of said tempered glass layer which temperature is maintained atsaid predetermined adhering temperature to form said adhesive layer; (e)attaching said protection layer on top of said adhesive layer of saidtempered glass layer by pressing said protection layer against said topsurface of said tempered glass layer which is maintained at saidpredetermined adhering temperature until said protection layer isintegrally attached on said tempered glass layer, wherein saidprotection layer has a circular center portion formed above said centralhole of said tempered glass layer; (f) cutting excessive edges of saidprotection layer to a size identical to said tempered glass layer; (g)pressing said center portion of said protection layer toward saidcentral hole of said tempered glass layer to increase a tension of aperipheral portion of said protection layer around said central hole ofsaid tempered glass layer and to extend and attach said protection layerto an upper edge of said central hole of said tempered glass layer; and(h) grinding said upper edge of said central hole of said tempered glasslayer until said center portion of said protection layer is separatedfrom said protection layer to form a center hole coaxially aligned withsaid central hole of said tempered glass layer.
 17. A patio tabletopglass, as recited in claim 16, wherein the step (a) further comprisesthe steps of cutting a large piece of glass board to form a circularshaped glass layer, drilling said central hole in said glass layer andtempering said glass layer by heating said glass layer to about 500°C.-550° C. and then immediately cooling down to 0° C.-40° C. to formsaid tempered glass layer.
 18. A patio tabletop glass, as recited inclaim 17, wherein, in the step (g), said center portion of saidprotection layer is pressed by a press mold, which has a round shapedpresser head at one end thereof, towards said central hole of saidtempered glass layer, wherein an inward pressing force of said pressinghead further presses said peripheral portion of said protection layer toextend and attach to said upper edge of said central hole of saidtempered glass layer.
 19. A patio tabletop glass, as recited in claim18, wherein, in the step (h), a rotating sand wheel is used to grind ata position of said corresponding upper edge of said central hole so asto reduce said thickness of said peripheral edge of said center portionuntil said center portion of said protection layer is separated fromsaid protection layer to form said center hole coaxially aligned withsaid central hole of said tempered glass layer.
 20. A patio tabletopglass, as recited in claim 19, wherein, in the step (a), said topsurface of said tempered glass layer is cleaned with neutral waterhaving a pH of
 7. 21. A patio tabletop glass, as recited in claim 11,wherein in the step (e) said adhesive layer has a thickness of 0.1 to0.2 mm.
 22. A patio tabletop glass, as recited in claim 19, wherein inthe step (e) said adhesive layer has a thickness of 0.1 to 0.2 mm.
 23. Apatio tabletop glass which is made by the steps of: (a) fully cleaningat least a top surface of a tempered glass layer having a central holethereon; (b) drying said tempered glass layer after cleaning; (c)heating said entire tempered glass layer to a predetermined adheringtemperature; (d) evenly applying a layer of acrylic adhesive on said topsurface of said tempered glass layer which temperature is maintained atsaid predetermined adhering temperature to form an adhesive layer; (e)attaching said protection layer having a width size larger than saidtempered glass layer on top of said adhesive layer of said temperedglass layer by pressing said protection layer against said top surfaceof said tempered glass layer which is maintained at said predeterminedadhering temperature until said protection layer is integrally attachedon said tempered glass layer, wherein said protection layer has acircular center portion formed above said central hole of said temperedglass layer; (f) cutting excessive edges of said protection layer to asize identical to said tempered glass layer; (g) pressing said centerportion of said protection layer toward said central hole of saidtempered glass layer to increase a tension of a peripheral portion ofsaid protection layer around said central hole of said tempered glasslayer and to extend and attach said protection layer to an upper edge ofsaid central hole of said tempered glass layer; and (h) grinding saidupper edge of said central hole of said tempered glass layer until saidcenter portion of said protection layer is separated from saidprotection layer to form a center hole coaxially aligned with saidcentral hole of said tempered glass layer.
 24. A patio tabletop glass,as recited in claim 23, wherein said predetermined adhering temperatureis between 45° C. to 65° C.
 25. A patio tabletop glass, as recited inclaim 23, wherein said protection layer has a thickness of 0.3 to 0.8mm.
 26. A patio tabletop glass, as recited in claim 24, wherein saidprotection layer has a thickness of 0.3 to 0.8 mm.
 27. A patio tabletopglass, as recited in claim 24, wherein said step (a) further comprisessaid steps of cutting a large piece of glass board to form a circularshaped glass layer having a specific decorative pattern provided on atleast said top surface, drilling said central hole in said glass layerand tempering said glass layer by heating said glass layer to about 500°C.-550° C. and then immediately cooling down to 0° C.-40° C. to formsaid tempered glass layer.
 28. A patio tabletop glass, as recited inclaim 27, wherein said adhesive layer has a thickness of 0.1 to 0.2 mm.29. A patio tabletop glass, as recited in claim 28, wherein, in the step(g), said center portion of said protection layer is pressed by a pressmold, which has a round shaped presser head at one end thereof, towardssaid central hole of said tempered glass layer, wherein an inwardpressing force of said pressing head further presses said peripheralportion of said protection layer to extend and attach to said upper edgeof said central hole of said tempered glass layer.
 30. A patio tabletopglass, as recited in claim 29, wherein, in the step (h), a rotating sandwheel is used to grind at a position of said corresponding upper edge ofsaid central hole so as to reduce said thickness of said peripheral edgeof said center portion until said center portion of said protectionlayer is separated from said protection layer to form said center holecoaxially aligned with said central hole of said tempered glass layer.31. A patio tabletop glass, as recited in claim 30, wherein, in step(a), said top surface of said tempered glass layer is cleaned withneutral water having a pH of 7.